Changing Downstream O2 Sensor - Jeep Wrangler Forum

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Old 05-05-2012, 08:40 AM   #1
Join Date: May 2012
Posts: 5
Changing Downstream O2 Sensor

Just bought a 99 Sport with 105k miles from a dealer so I have no idea what has been replaced by the previous owner so I'm just doing some simple stuff on my own... tune up, trans fluid, etc. It did run a little rough in the beginning but that seemed to clear right up after I changed the upstream O2 sensor, which was easy after getting the old one loose. I figured I may as well change the downstream as well so I bought the part, and then discovered where it is... between the cat & muffler, above a skid plate.

My question is whether anyone has changed this one on their own. It looks like there is very little space to work, and not much room to even turn a wrench. Can it be done without dropping the skid plate? Seems like too much of an effort to fix something which might not even need it. I should also say I have the model with 2 sensors (not 4).


jblake119 is offline   Quote
Old 05-05-2012, 10:55 AM   #2
Join Date: Oct 2011
Posts: 1,721
Originally Posted by jblake119 View Post
Seems like too much of an effort to fix something which might not even need it.
If you don't have a DTC, leave it alone. The downstream sensor has nothing to do with how the engine runs.
tangofox007 is online now   Quote

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